Windows 10: Something wrong with hard drive, can't scan it or anything to see what's wrong

Hiya,I believe something has been wrong with my main hard drive for a while. Here are all the issues and solutions I've tried.1 My PC tells me that it's scanning and repairing the C: drive every time I boot it up.2 I can't defrag my drive, even though it used to work.3 I've tried checking errors by going to my Hard Drive > Properties > Tools > Error checking, but it tells me "Windows can't repair the drive while it's in use" and tells me to restart to repair the drive. Doesn't work after restarting.4 I've tried the previous step but with a clean boot and still gives me the same re

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Wrong Hard Drive Total Space




Posting same image again which you guys are discussing

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And I said earlier this happened after I tried to Shrink the Volume. It was fine before that. showing correct data

 

Installation of OS into virtual box, final step (what's wrong?)

It's not really clear what you are trying to do. You assign the ISO to an optical drive. From your screenshot you are trying to assign it to a hard drive.

 

Windows 7 booting off wrong drive?!?!?

Please move if this is in the wrong place.

I have two hard drives, a 1.5TB drive, and a 160GB drive. Windows is installed on the 1.5TB drive, as are all my files and programs. The 160GB drive has a bunch of old files, and apparently the bootmgr and boot folder. Nothing else is on the 160GB drive, other than media files etc.

If I remove the 160GB drive from the machine, windows refuses to boot, plug it back in, it works fine. The setup with two hard drives I have now is temporary, as the 160GB drive will go into another machine.

My question is, can someone give me a step by step on how to make windows force to boot off the 1.5TB drive, ignoring the 160GB drive in the boot process completely?
I don't know how to do this in Windows 7, on XP I would just run the /fixmbr command and its related ones.

Any help would be appreciated.

Note: I would really really rather not have to wipe and reinstall, I know it can be done without one as I've had this issue with XP before.